Mica Schist
Muscovite/Biotite Schist
metamorphic
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Quartz (various varieties)
SiO₂ (Silicon Dioxide)
Mineral
Bauxite Ore
Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)
Mineral
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Calcite on Limestone
Calcium Carbonate (CaCO3) on Sedimentary Rock
mineral
Granitic Pegmatite (River Rock specimen)
Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)
igneous
Mixed Mineral Collection (with Quartz, Beryl, and host rock)
Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite
mineral
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
K2 Jasper
Azurite in Granite
igneous
Schist
Mica Schist
metamorphic
Breccia Pebble
Sedimentary Breccia
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Grey Agate
Silicon Dioxide (SiO2) - variety: Agate/Chalcedony
mineral
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Nuummite
Antophyllite-Gedrite (Orthorhombic amphiboles)
metamorphic
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Puddingstone
Conglomerate
Sedimentary
Tiger's Eye
SiO2 (Silicon Dioxide with inclusions of Goethite/Limonite)
Metamorphic
Tiger's Eye
Pseudomorph of Crocidolite (SiO2 with iron oxides)
mineral
Rhodonite with Manganese Oxides
Rhodonite (Mn,Fe,Mg,Ca)SiO3
metamorphic
Mixed Polished Gemstones (Tumbled Stones)
Mixed Silicates and Oxides (SiO2, KAlSi3O8, Ca2Al2Be3Si6O22, etc.)
mineral
Greenschist / Greenstone
Greenschist facies metabasite
metamorphic
Granite
Granite
igneous
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary vugs
sedimentary
Vesicular Basalt with Zeolite
Mafic volcanic rock with Hydrated Aluminosilicate minerals (Zeolite group)
igneous
Schist
Mica Schist (Quartz-Muscovite-Biotite Schist)
metamorphic
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Gneiss
Gneiss
metamorphic
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Ruby in Zoisite (Anyolite)
Corundum var. Ruby in Zoisite (Al2O3 + (Ca2Al3(SiO4)3(OH)))
metamorphic
Unakite
Unakite (Epidotized Granite)
metamorphic
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Chrysoprase
Chrysoprase (a variety of Chalcedony, SiO₂)
Mineral
Jasper with Quartz Veins
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral